void m68000_execute2(UINT32 start, UINT32 break_point)
{
int nest_counter = 0;
UINT32 pc, old_pc, opcode;
c68k_struc C68K_temp;
old_pc = C68k_Get_Reg(&C68K, M68K_PC);
memcpy(&C68K_temp, &C68K, sizeof(c68k_struc));
C68k_Set_Reg(&C68K_temp, C68K_PC, start);
C68K_temp.A[5] = 0x108000;
C68K_temp.A[7] -= 4 * 8 * 2;
while ((pc = C68k_Get_Reg(&C68K_temp, M68K_PC)) != break_point)
{
opcode = Memory_ReadW(pc);
if (opcode == 0x4e75)
{
// rts
nest_counter--;
if (nest_counter < 0) break;
}
else if (opcode == 0x6100)
{
// bsr 16
nest_counter++;
}
else if ((opcode & 0xff00) == 0x6100)
{
// bsr 8
nest_counter++;
}
else if ((opcode & 0xffc0) == 0x4e80)
{
// jsr
nest_counter++;
}
C68k_Exec(&C68K_temp, 1);
}
C68k_Set_Reg(&C68K, C68K_PC, old_pc);
}
void C68k_Reset(c68k_struc *CPU)
{
UINT32 PC;
memset(CPU, 0, (UINT32)&CPU->BasePC - (UINT32)CPU);
CPU->flag_I = 7;
CPU->flag_S = C68K_SR_S;
CPU->A[7] = READ_PCREL_32(0);
PC = READ_PCREL_32(4);
C68k_Set_Reg(CPU, C68K_PC, PC);
}
void m68000_set_reg(int regnum, UINT32 val)
{
switch (regnum)
{
case M68K_PC: C68k_Set_Reg(&C68K, C68K_PC, val); break;
case M68K_USP: C68k_Set_Reg(&C68K, C68K_USP, val); break;
case M68K_MSP: C68k_Set_Reg(&C68K, C68K_MSP, val); break;
case M68K_SR: C68k_Set_Reg(&C68K, C68K_SR, val); break;
case M68K_D0: C68k_Set_Reg(&C68K, C68K_D0, val); break;
case M68K_D1: C68k_Set_Reg(&C68K, C68K_D1, val); break;
case M68K_D2: C68k_Set_Reg(&C68K, C68K_D2, val); break;
case M68K_D3: C68k_Set_Reg(&C68K, C68K_D3, val); break;
case M68K_D4: C68k_Set_Reg(&C68K, C68K_D4, val); break;
case M68K_D5: C68k_Set_Reg(&C68K, C68K_D5, val); break;
case M68K_D6: C68k_Set_Reg(&C68K, C68K_D6, val); break;
case M68K_D7: C68k_Set_Reg(&C68K, C68K_D7, val); break;
case M68K_A0: C68k_Set_Reg(&C68K, C68K_A0, val); break;
case M68K_A1: C68k_Set_Reg(&C68K, C68K_A1, val); break;
case M68K_A2: C68k_Set_Reg(&C68K, C68K_A2, val); break;
case M68K_A3: C68k_Set_Reg(&C68K, C68K_A3, val); break;
case M68K_A4: C68k_Set_Reg(&C68K, C68K_A4, val); break;
case M68K_A5: C68k_Set_Reg(&C68K, C68K_A5, val); break;
case M68K_A6: C68k_Set_Reg(&C68K, C68K_A6, val); break;
case M68K_A7: C68k_Set_Reg(&C68K, C68K_A7, val); break;
default: break;
}
}
